#version 100
precision mediump float;

attribute vec3 pos;
attribute vec2 uv;
attribute vec3 normal;
uniform vec3 wpos;

varying vec2 texcoord;
varying vec3 v_normal;
varying float v_position;

uniform mat4 view;
uniform mat4 proj;

void main() {
    mat4 drawProj = mat4(
        vec4(-1.0, 0.0, 0.0, 0.0), 
        vec4(0.0, 1.0, 0.0, 0.0), 
        vec4(0.0, 0.0, -1.0, 0.0), 
        vec4(-wpos.x, wpos.y, -wpos.z, 1.0)
    );
    texcoord = uv;

    v_normal = normal;

    gl_Position = proj * view * drawProj * vec4(pos, 1.0);

    v_position = length((view * drawProj * vec4(pos, 1.0)).xyz);
}